Tag Archives: kite flying

Ultrafoil 15 mods for stability part 1

This gallery contains 8 photos.

Shortening the middle bridle line had an adverse effect on the stability of the Ufoil. it actually made things worse.  A short discussion with Ivo van Olmen pointed towards excessive internal pressure so I decided to vent the crazy weaving … Continue reading

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Ultrafoil 15 Bft 5 stabilty

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Update. Ultrafoil 15 crash. My confidence in the Ultrafoil has been building and I think I have found it’s upper wind speed limit. It does well at the lower end of Bft 4  but can be a real handful as … Continue reading

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ITW Ultrafoil 15

This gallery contains 9 photos.

I saw this in use by Randy Anglin and promised myself I’d try one out when the oportunity arose. In prep for the OWLP workshop (which is stalled by rain again) I made a visit to my favorite kite store: … Continue reading

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Look: no gloves!

This gallery contains 5 photos.

I have had an original Dan LeighR8 in my possession for a while now. It’s an interesting lifter and I’m lucky to have it- Dan doesn’t make them any more. While my RC controller is at the machine shop I … Continue reading

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2 kites, 2 cameras and a windpump

This gallery contains 11 photos.

The rain radar showed a clear spot half an hour from where I was working, I watched the met data update and clipped off work as quick as I could to try and catch the light over the marshes. All … Continue reading

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Didak Explorer 16 overblown at Bft 6

This gallery contains 15 photos.

Packing small. I have been working with the flowforms as kites to bike with. Getting the deltas on the bike is do-able but awkward. I ended up with a fairly badly loaded bike: This works but gets awkward under low … Continue reading

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More thought on a kite stability index

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Paul Chapman pointed out the definitive text on kite stability theory is by CF Marvin, his book The Mechanics and Equilibrium of Kites  published in 1898. As a begining I suggest ‘Marvin’ as the unit of kite stability. Paul suggests … Continue reading

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A kite stability index curve

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In Damian Sailors paper this graph is used to compare kite aspect ratio with stability and wind speed:It’s quite a confusing graph to read as it seems to have 3 axes: stability, aspect ratio and wind speed. The 2 kites … Continue reading

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Some thoughts on a kite stability index

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The impact of a tail on the stability of the DL Trooper is something of a revelation to me- a simple thing can turn an unstable low AoA kite into a steady lifter albeit with decreased lift. Kite stability is … Continue reading

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Bft 5 fly off.

This gallery contains 13 photos.

The beefy westerlies have kept up this week so I have been able to to to grips with Bft 5  (19-24mph) and see how 2 ‘high speed’ KAP contenders fare. To get an idea of the comparative performance of the … Continue reading

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